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I could not find the property of window when calling the JavaScript method in Blazor using JS interop.

You have to refer to the JavaScript method implemented JS (external-script.js) file in index.html properly and then call the function from .NET using IJSRuntime.

[wwwroot/index.html]

<body>
    <app>Loading...</app>

    <script src="_framework/blazor.webassembly.js"></script>
    <script src="external-script.js"></script>
</body>

[wwwroot/external-script.js]

window.methods = {
    print: function (message) {
        return "from js " + message
    }
}

[Pages/Index.razor]

@inject IJSRuntime JSRuntime

@code {
  private async void PrintMessage()
  {
    Console.WriteLine(await JSRuntime.InvokeAsync<string>("methods.print", "here is the message"));
  }

}

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